No start....help please.

[warrenbrunick]

I have been fighting this problem for months now and still cant figure it out. the truck will start when its cold for about 10 sec and then it will die. when it runs for those 10 seconds it will not rev up past 1000 rpm's and it sounds like it is running off four cylinders. the only codes that are coming up are ICP sensor, ICP out of range, map sensor, and boost sensor. i have changed every one of those sensors except for the boost sensor. I have also changed the IPR o-rings, hpop sensor, cam sensor, PCM, IDM, and valve cover gastkets. does anybody know whats going on with it? could it be a wiring harness issue or fuel pump?

[bjs505]

Sounds like glow plug relay. But not sure. I'm sure someone else will chime in.

[ToMang07]

Originally Posted by warrenbrunick

I have been fighting this problem for months now and still cant figure it out. the truck will start when its cold for about 10 sec and then it will die. when it runs for those 10 seconds it will not rev up past 1000 rpm's and it sounds like it is running off four cylinders. the only codes that are coming up are ICP sensor, ICP out of range, map sensor, and boost sensor. i have changed every one of those sensors except for the boost sensor. I have also changed the IPR o-rings, hpop sensor, cam sensor, PCM, IDM, and valve cover gastkets. does anybody know whats going on with it? could it be a wiring harness issue or fuel pump?

Not sure about the OBS trucks, but the 99-03 7.3's have a UVCH (Under Valve Cover Harness) The UVCH has a tendency to back out causing one bank to misfire or not fire. Could be worth checking into. Heres a anywho.

[warrenbrunick]

well i finally got a fuel pressure tester and tested the pressure and the needle is not moving on my pressure test, it says 0 psi. so should i try a new fuel pump or lift pump whatever it is?

[ToMang07]

Originally Posted by warrenbrunick

well i finally got a fuel pressure tester and tested the pressure and the needle is not moving on my pressure test, it says 0 psi. so should i try a new fuel pump or lift pump whatever it is?

Before you do that, try removing the chip. Also, check all your fuses. If the fuel bowl heater went it will short out the fuse to the PCM. Is your WTS light coming on/off like normal?

[warrenbrunick]

I took the chip off when i changed the computer,so its not programed right now, and all the fuses are good and i get a wait to start light like normal and i hear the glow plug relay click.

[540milotalon]

Check all wiring harness (under and outside ) for the valve cover gaskets.